Process of dyeing cellulose esters and cellulose ethers



Patented June 8, 1926.

UNITED STATES wanna nursnane AND wmrmnn nnnrnrcn, or LEVERKUSEN, cLAUs wanunn on COLOGNE-ON-THE-MULHEI'M, AND LUDWIG ZEH, F ravnmwsnn, GERMANY L ,1,ss7,70s

PATENT OFFICE.

.LSSIGNOBS TO GBASSELLI DYESTUFF CORPORATION, OF NEW YORK, N. Y.', A GOR- PORATION OF DELAWARE.

PROCESS OF DYEING CELLULOSE TESTERS AND GELLULOSE ETHERS.

Io Drawing. Application filed June 8, 1925, Serial No. '35,770, and in Germany June 26, 1924.

water with the eventual addition of the usual dye adjuvants such as Glaubers salt,

acetic acid if desired, and then to enter the dye bath with the cellulose material at a temperature of not exceeding 70 C. and to leave in the dyebath until the desired shade is obtained. The goods are then rinsed, squeezed and dried. When dyeing cellulose acetate -silk for instance amounts of -3 parts of dyestufi to 100 parts of fibre in to 1 per thousand solution yields shades of great brilliancy and depth. In dyeing other organo-oxy-cellulose material the process of applying ortho-aminoanthraquinone sulfonic acids to same can be modified so as to ada t itself to the particular material without eparting from the spirit of our invention.

The aminoanthraquinone sulfonic acids featured by our invention are the compounds in which the amino and sulfonic acid groups are in ortho position to each other, as for instance in 1-2, 21, 2-3 position and the l-POSitiOIl contains hydrogenor a substitucut other than an amino group or a hydroxyl group such as halogen or a carbon radicle or sulfur attached to a carbon radicle. The compounds. are represented by the general formula for a sulfo group, e third X stands for hydrogen and Y stands for hydrogen, halogen, acarbon radicle or a. S-carbon radicle. These simple ortho aminoanthraquinone sulfonic acids impart to the organo-oxycellulose compounds yellow to orange shades. Further substitution in the anthraquinone nucleus modifies the shade and through the use of the various substituted ortho-aminoanthraquinone 'sulfonic acids shades rangings'practically over the whole color scale can be obtained.

The ease of application, the excellent fast ness properties and the wide range of shades obtained by our novel process makes it excedingly valuable for the practical application of organo-oxy cellulose compound materials.

The table below shows a few of the shades that can be obtained by the use of our ortho-aminoanthraquinone sulfonic acids Shade on eellu Dyestufi lose acetate silk l-am inoafithraquinone-Z-siflfonic acid- Orange.

2-aminoanthraqulnone-1-sulionic acid- Yellow. 2-aminoanthraquinone-3-sulfonic acid- Yellow. l-amino4-bromoanthraquinone-2sulfomc acld Yellow ish-red. 1-an1in0-5-toluidoanthrequinone-2-sullonic acid Dark-red. l-amino-4-tlgiotolylanthraquinone-2sulfonic acid--. Red-violet. l-amino-l-drhydroglyoxalylanthrsqmnone-Mul- Ionic arid Violet.

in which one X stands for an amino glOlg stan and an X in ortho osition thereto for a sulfo up, t e third X stands for hydrogen an Y stands for hydrogen, halogen, a carbon radicle or a S-carbon radicle. 2. Process of dyeing organo-oxy-cellulose materials which consists in treating the same with water solutions'of ortho-aminoanthraquinone sulfonic acid compounds of the general formula in which one X stands for an amino grou v materials dyed with ortho-aminoanthraquinone sulfonic acid compounds of the general formula and an X in-ortho in which one X stands for an amino grou osition thereto stan for a sulfo roup, e third X stands for hydrogen an Y stands for hydrogen, halogen, a carbon radicle or a S-carbon radicle. 4. As new products cellulose acetate silks dyed with ortho-aminoanthraquinone sulfonic acid compounds of the general formula in which one X stands for an amino grou and an X in ortho position thereto stan S for a sulpho group, the third X stands for hydrogen and Y stands for hydrogen, halogen, a carbon radicle or a S-carbon radicle. In testimony whereof we have hereunto set our hands.

WALTER DUISBERG. WINFRIED HENTRICH. CLAUS WEINAND. LUDWIG ZEH. 

